Roast the ground hazelnuts in a non-oiled pan and then leave to cool.
Mix butter, sugar and a pinch of salt with the hand mixer for at least 8 minutes until very creamy. Gradually stir in the eggs. Mix the flour, baking powder and cooled nuts and stir in alternately with the milk.
Spread half of the dough into a well-greased 25 cm loaf pan. Break the chocolate into pieces and place on the dough. Spread the rest of the dough on top and smooth it out.
Bake in a preheated oven at 180 degrees for about 45 - 50 minutes. Let rest briefly in the mold. Then turn out and let cool down completely.
Melt the glaze in a hot water bath and spread it on the cake. Sprinkle with the hazelnut leaves. Let it set, cut into 10 pieces.